Moved CellView to Node.

Dependency layout adjustments.
rustfmt modifications.

node/src/cell.rs

@@ -0,0 +1,19 @@
+use core::cell::Cell;
+
+/// Provides a view only reference to a [Cell].
+/// Useful alternative to `&Cell` when an API wants to control where a [Cell]s value can be set.
+#[derive(Copy, Clone)]
+pub struct CellView<'a, T: Copy>(&'a Cell<T>);
+
+impl<'a, T: Copy> CellView<'a, T> {
+    #[inline]
+    pub fn get(self) -> T {
+        self.0.get()
+    }
+}
+
+impl<'a, T: Copy> From<&'a Cell<T>> for CellView<'a, T> {
+    fn from(value: &'a Cell<T>) -> Self {
+        CellView(value)
+    }
+}

node/src/lib.rs

@@ -1,14 +1 @@
-pub fn add(left: usize, right: usize) -> usize {
-    left + right
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn it_works() {
-        let result = add(2, 2);
-        assert_eq!(result, 4);
-    }
-}
+mod cell;